Cisco 400-007 Exam With Confidence Using Practice Dumps

B: Service chaining in NFV can create suboptimal traffic flows depending on how virtualized functions are distributed.

E: NFV often requires orchestration platforms for lifecycle management, scaling, and automation of VNFs.

Why other options are incorrect:

A: Bandwidth utilization may not necessarily increase.

C: NFV enables use of commodity servers, not high-end routers.

D: OpenFlow is not mandatory for NFV deployment.

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In a standard 3-tier data center architecture (access, aggregation, core), the Layer 2-to-Layer 3 boundary typically resides at the aggregation layer. When extending VLANs between data centers using a Layer 2 interconnection, the most optimal and scalable termination point is at the aggregation layer because:

It naturally handles VLAN demarcation and Layer 3 boundary.

Spanning Tree Protocol (STP) domains remain contained within local aggregation blocks.

The core remains Layer 3-only, ensuring scalability, stability, and no STP involvement.

Simplifies traffic engineering, FHRP operations, and minimizes control-plane complexity across sites.

This design is consistent with CCDE v3.1 best practice where VLAN extension is isolated to aggregation to avoid STP scaling issues and maintain hierarchical design principles.

Why other options are incorrect:

A: STP isolation can still be achieved at aggregation while keeping the core Layer 3.

C: Access layer extensions would increase STP scope and complexity unnecessarily.

D: Core termination violates Layer 3 core design, bringing STP into the core, which is not scalable.

B (Software as a Service - SaaS):SaaS provides end users with complete applications hosted and managed by third-party providers, accessed via web interfaces.

Other options explained:

A: PaaS provides platforms for application development, not complete applications.

C: IaaS provides compute/storage resources but not full applications.

D: WaaS (Workspace as a Service) is a niche model, not generally used as standard SaaS definition.